1 (in-package :sb-bsd-sockets)
4 ((name :initarg :name :accessor host-ent-name)
5 (aliases :initarg :aliases :accessor host-ent-aliases)
6 (address-type :initarg :type :accessor host-ent-address-type)
7 ; presently always AF_INET
8 (addresses :initarg :addresses :accessor host-ent-addresses))
9 ;; FIXME: Our Texinfo documentation extracter need at least his to spit
10 ;; out the signature. Real documentation would be better...
13 (defgeneric host-ent-address (host-ent)
14 ;; FIXME: Our Texinfo documentation extracter need at least his to spit
15 ;; out the signature. Real documentation would be better...
18 (defmethod host-ent-address ((host-ent host-ent))
19 (car (host-ent-addresses host-ent)))
21 ;(define-condition host-not-found-error (socket-error)) ; host unknown
22 ;(define-condition no-address-error (socket-error)) ; valid name but no IP address
23 ;(define-condition no-recovery-error (socket-error)) ; name server error
24 ;(define-condition try-again-error (socket-error)) ; temporary
26 (defun make-host-ent (h)
27 (if (sb-grovel::foreign-nullp h) (name-service-error "gethostbyname"))
28 (let* ((length (sockint::hostent-length h))
29 (aliases (loop for i = 0 then (1+ i)
30 for al = (sb-alien:deref (sockint::hostent-aliases h) i)
34 (loop for i = 0 then (1+ i)
35 for ad = (sb-alien:deref (sockint::hostent-addresses h) i)
36 until (sb-alien:null-alien ad)
37 collect (ecase (sockint::hostent-type h)
40 (let ((addr (make-array 4 :element-type '(unsigned-byte 8))))
41 (loop for i from 0 below length
42 do (setf (elt addr i) (sb-alien:deref ad i)))
45 (sb-alien:cast ad sb-alien:c-string))))))
46 (make-instance 'host-ent
47 :name (sockint::hostent-name h)
48 :type (sockint::hostent-type h)
50 :addresses addresses)))
52 (defun get-host-by-name (host-name)
53 "Returns a HOST-ENT instance for HOST-NAME or throws some kind of condition.
54 HOST-NAME may also be an IP address in dotted quad notation or some other
55 weird stuff - see gethostbyname(3) for grisly details."
56 (make-host-ent (sockint::gethostbyname host-name)))
58 (defun get-host-by-address (address)
59 "Returns a HOST-ENT instance for ADDRESS, which should be a vector of
60 (integer 0 255), or throws some kind of error. See gethostbyaddr(3) for
62 (sockint::with-in-addr packed-addr ()
63 (let ((addr-vector (coerce address 'vector)))
64 (loop for i from 0 below (length addr-vector)
65 do (setf (sb-alien:deref (sockint::in-addr-addr packed-addr) i)
67 (make-host-ent (sockint::gethostbyaddr packed-addr
71 ;;; The remainder is my fault - gw
73 (defvar *name-service-errno* 0
74 "The value of h_errno, after it's been fetched from Unix-land by calling
75 GET-NAME-SERVICE-ERRNO")
77 (defun name-service-error (where)
78 ;; FIXME: Our Texinfo documentation extracter need at least his to spit
79 ;; out the signature. Real documentation would be better...
81 (get-name-service-errno)
82 ;; Comment next to NETDB_INTERNAL in netdb.h says "See errno.".
83 ;; This special case treatment hasn't actually been tested yet.
84 (if (= *name-service-errno* sockint::NETDB-INTERNAL)
87 (condition-for-name-service-errno *name-service-errno*)))
88 (error condition :errno *name-service-errno* :syscall where))))
90 (define-condition name-service-error (condition)
93 :reader name-service-error-errno)
94 (symbol :initform nil :initarg :symbol :reader name-service-error-symbol)
95 (syscall :initform "an unknown location" :initarg :syscall :reader name-service-error-syscall))
96 (:report (lambda (c s)
97 (let ((num (name-service-error-errno c)))
98 (format s "Name service error in \"~A\": ~A (~A)"
99 (name-service-error-syscall c)
100 (or (name-service-error-symbol c)
101 (name-service-error-errno c))
102 (get-name-service-error-message num))))))
104 (defmacro define-name-service-condition (symbol name)
106 (define-condition ,name (name-service-error)
107 ((symbol :reader name-service-error-symbol :initform (quote ,symbol))))
108 (push (cons ,symbol (quote ,name)) *conditions-for-name-service-errno*)))
110 (defparameter *conditions-for-name-service-errno* nil)
112 (define-name-service-condition sockint::NETDB-INTERNAL netdb-internal-error)
113 (define-name-service-condition sockint::NETDB-SUCCESS netdb-success-error)
114 (define-name-service-condition sockint::HOST-NOT-FOUND host-not-found-error)
115 (define-name-service-condition sockint::TRY-AGAIN try-again-error)
116 (define-name-service-condition sockint::NO-RECOVERY no-recovery-error)
117 ;; this is the same as the next one
118 ;;(define-name-service-condition sockint::NO-DATA no-data-error)
119 (define-name-service-condition sockint::NO-ADDRESS no-address-error)
121 (defun condition-for-name-service-errno (err)
122 (or (cdr (assoc err *conditions-for-name-service-errno* :test #'eql))
127 (defun get-name-service-errno ()
128 (setf *name-service-errno*
129 (sb-alien:alien-funcall
130 (sb-alien:extern-alien "get_h_errno" (function integer)))))
135 (sb-alien:define-alien-routine "hstrerror"
139 (alien:def-alien-routine "hstrerror"
142 (defun get-name-service-error-message (num)